mirror of https://github.com/knative/pkg.git
78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package gke
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import (
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"errors"
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"fmt"
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"time"
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container "google.golang.org/api/container/v1beta1"
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)
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// These are arbitrary numbers determined based on past experience
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var (
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creationTimeout = 20 * time.Minute
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deletionTimeout = 10 * time.Minute
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)
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const (
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pendingStatus = "PENDING"
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runningStatus = "RUNNING"
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doneStatus = "DONE"
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)
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// Wait depends on unique opName(operation ID created by cloud), and waits until
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// it's done
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func Wait(gsc SDKOperations, project, region, zone, opName string, wait time.Duration) error {
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var op *container.Operation
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var err error
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timeout := time.After(wait)
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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for {
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select {
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// Got a timeout! fail with a timeout error
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case <-timeout:
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return errors.New("timed out waiting")
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case <-ticker.C:
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// Retry 3 times in case of weird network error, or rate limiting
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for r, w := 0, 50*time.Microsecond; r < 3; r, w = r+1, w*2 {
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op, err = gsc.GetOperation(project, region, zone, opName)
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if err == nil {
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if op.Status == doneStatus {
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return nil
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} else if op.Status == pendingStatus || op.Status == runningStatus {
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// Valid operation, no need to retry
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break
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} else {
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// Have seen intermittent error state and fixed itself,
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// let it retry to avoid too much flakiness
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err = fmt.Errorf("unexpected operation status: %q", op.Status)
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}
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}
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time.Sleep(w)
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}
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// If err still persist after retries, exit
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if err != nil {
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return err
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}
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}
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}
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}
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